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Not to take away from this article, but there are brewers like Lucky
Labrador Brewing Company in Oregon which uses Solar Thermal
Collectors on their roof top. The system circulates water and
Propylene glycol through a closed loop, which is heated by the
Solar collectors, then returns it to the storage tank, releasing the
heat and warming the brewing water. The Lucky Labrador uses a
lot of hot water to make beer therefore this technology is best
suited for their reduction of energy consumption.